[Zope-dev] More almost __call__ ;-)

[Jim Fulton]

Shane Hathaway wrote:
> 
> Jim Fulton wrote:
> >
> > Chris Withers wrote:
> > >
> > > Toby Dickenson wrote:
> > > > <http://www.zope.org/Members/htrd/howto/FunctionTemplate>
> > > >
> > > > you would use....
> > > >
> > > >     def a_method(self,md):
> > > >         do_stuff_with(md['param1'],md['param2'])
> > > >     a_method = FunctionTemplate(a_method)
> > >
> > > That looks like it'll do the trick... I wonder if there's any way you
> > > can role it up into a Product so that I don't need to have
> > > FunctionTemplate.py in each folder of a product that needs to use it?
> >
> > Is it *really* the case that you often want to method to be called directly
> > via the Web *and* and from DTML?  This doesn't seem right to me.
> 
> As I understand it, that's not the issue.  Chris wants to receive the
> DTML namespace implicitly.
> 
> > In any case, if you *just* want to get your function to be
> > called from DTML (and your class is an extension class), you can give
> > it the isDocTemp attribute like so:
> >
> >   class MyClass(.... include some extension class ...):
> >
> >     some_methodisDocTemp=1
> >     def some_method(trueself, self, REQUEST, RESPONSE=None):
> >         ....
> 
> That's a good idea, I wish I'd thought of it. :-)
> 
> However, the new calling convention (__render_with_namespace__, or
> something like that) might break "isDocTemp" code.

I thought of that, but I don't think so. There are obviously 
enough people using the isDocTemp thing that we'll probably need to
keep supporting it.  The use of a separate render method won't be
convenient for iplementing simple methods. Not that that is necessarily
that critical.

> > Note that if you get called from the web, RESPONSE will
> > not be none. This is a handy way to decide if you
> > are called from the web or as a sub-template. Of course,
> > someone could pass a non-None RESPONSE argument directly.
> 
> This convention is helpful but not at all documented, so products (ZWiki
> is a good example) often break this convention.

Which convention? The passing of arguments with names meaningful to
the publisher is certainly well documented.

Jim

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